Solapur-University-M.Sc. – Electronics (Semester-I)-2019-On Power Electronics
| Sr. No | Questions with multiple options |
| 1. | A device that converts AC into DC is called as _____
(a) Chopper (b) Inverter (c) Rectifier (d) None of these |
| 2. | In SAC technique the average output voltage is controlled by varying _____
(a) Conduction angle (b) Extinction angle (c) Firing angle (d) All of these |
| 3. | Step down cycloconverter has output frequency ______ supply frequency.
(a) Equal to (b) Less than (c) Greater than (d) Greater than equal to |
| 4. | The class E choppers has ____ quadrant operation.
(a) One (b) Two (c) Four (d) Three |
| 5. | In SPWM technique modulation index is _______
(a) 1 (b) 0 to 1 (c) 0 to 10 (d) 0 to 0.1 |
| 6. | In PWM technique the output voltage is controlled by changing the ______
(a) Firing angle (b) Width of pulses (c) Extinction angle (d) All of these |
| 7. | The output voltage of single phase bridge inverter is _____ wave.
(a) Square (b) Sine (c) Triangular (d) Ramp |
| 8. | The _______ provide variable output voltage with fixed frequency.
(a) Inverter (b) Cycloconverter (c) AC voltage controllers (d) Chopper |
| 9. | In cycloconverter output is controlled by controlling the ______ angle of the thyristors.
(a) Delay (b) Conduction (c) Both a & b (d) Extinction |
| 10. | In choppers, for chopping period T, the output voltage can be controlled by varying _______ constant.
(a) T keeping T on (b) T on keeping T (c) T off keeping T (d) T off keeping T on |
| 11. | In AC voltage controller if the SCRs are switched on for 25 cycles and off for 75 cycles then the duty would be _____
(a) 4.0 (b) 0.20 (c) 3.0 (d) 0.25 |
| 12. | The Mc Murray-Bedford inverter uses ______ technique of commutation.
(a) Voltage commutation (b) Current commutation (c) Auxiliary commutation (d) Natural |
| Data Collected By – K. Jeyanthi | |
| Published on – 10th Nov 2021 | |
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